A powerful file-storing and sharing app that syncs wirelessly between devices. Create a school account then load it onto each of your iPads. Students can upload work, snapshots, etc. to your folder or upload your own documents. For the latter, let students choose from various activities, maneuver digitally from bellringers to guided or independent practice without passing out papers, or differentiate instruction for every learner by file type.

Oh yeah, and less printing!